So the good news is... I got Everquest working after another 5 hours of messing with WineSkin - but there are a few quirks to work out...
Firstly if I run the game windowed mode I just get a pink background with huge white letters and no game.
Secondly, if I run the game in fullscreen mode it does work, including the mouse except for Mouselook which goes insanely crazy.
I downloaded Wineskin Winery and followed the instructions in the below video to create a brand new wrapper with the latest versions of WineSkin.
How to Install Project 1999 on a Mac
Installed all the fonts from wineskin-tools-winetricks, changed the MaxCPU=1 flag, changed the Engine to WS9WineCX____ rather than WS9WineCXG____; trial and error really I just tried them one by one until something worked.